bisecting fixing commit since 030194a5b292bb7613407668d85af0b987bb9839 building syzkaller on 4a003785c5484e99127a20e069a5edddcb8c24d5 testing commit 030194a5b292bb7613407668d85af0b987bb9839 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 1ded189afb9b2919047e151a34479886b28bc62dd1991f4d37be9dbb96a0496a run #0: crashed: KASAN: use-after-free Read in search_by_entry_key run #1: crashed: KASAN: use-after-free Read in search_by_entry_key run #2: crashed: KASAN: use-after-free Read in search_by_entry_key run #3: crashed: KASAN: use-after-free Read in search_by_entry_key run #4: crashed: KASAN: out-of-bounds Read in search_by_entry_key run #5: crashed: KASAN: use-after-free Read in search_by_entry_key run #6: crashed: KASAN: use-after-free Read in search_by_entry_key run #7: crashed: KASAN: use-after-free Read in search_by_entry_key run #8: crashed: KASAN: use-after-free Read in search_by_entry_key run #9: crashed: KASAN: use-after-free Read in search_by_entry_key run #10: crashed: KASAN: use-after-free Read in search_by_entry_key run #11: crashed: KASAN: use-after-free Read in search_by_entry_key run #12: crashed: KASAN: use-after-free Read in search_by_entry_key run #13: crashed: KASAN: use-after-free Read in search_by_entry_key run #14: crashed: KASAN: use-after-free Read in search_by_entry_key run #15: crashed: KASAN: use-after-free Read in search_by_entry_key run #16: crashed: KASAN: use-after-free Read in search_by_entry_key run #17: crashed: KASAN: use-after-free Read in search_by_entry_key run #18: crashed: KASAN: use-after-free Read in search_by_entry_key run #19: crashed: KASAN: use-after-free Read in search_by_entry_key testing current HEAD 5c66974a63046780925e5d99b6dc6631fe2f9a31 testing commit 5c66974a63046780925e5d99b6dc6631fe2f9a31 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 6dac3caddcafffc93f92b3120a42fb74941c8b4008f941d6034c1051a7d77f3d all runs: crashed: KASAN: use-after-free Read in search_by_entry_key revisions tested: 2, total time: 27m35.071026259s (build: 18m5.775538178s, test: 8m53.986214252s) the crash still happens on HEAD commit msg: Linux 4.19.202 crash: KASAN: use-after-free Read in search_by_entry_key REISERFS (device loop4): Using rupasov hash to sort names wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 ================================================================== IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready BUG: KASAN: use-after-free in bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] BUG: KASAN: use-after-free in search_by_entry_key+0xbf9/0xf30 fs/reiserfs/namei.c:164 Read of size 4 at addr ffff8880804b8004 by task syz-executor.4/9868 CPU: 1 PID: 9868 Comm: syz-executor.4 Not tainted 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x226 lib/dump_stack.c:118 print_address_description.cold.6+0x9/0x211 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:396 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:443 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] search_by_entry_key+0xbf9/0xf30 fs/reiserfs/namei.c:164 reiserfs_find_entry.part.5+0x15a/0x17f0 fs/reiserfs/namei.c:321 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 reiserfs_find_entry fs/reiserfs/namei.c:367 [inline] reiserfs_lookup+0x216/0x420 fs/reiserfs/namei.c:367 __lookup_slow+0x20d/0x3f0 fs/namei.c:1672 REISERFS (device loop3): checking transaction log (loop3) lookup_one_len+0x132/0x160 fs/namei.c:2544 reiserfs_lookup_privroot+0x94/0x270 fs/reiserfs/xattr.c:970 reiserfs_fill_super+0x1139/0x26b0 fs/reiserfs/super.c:2197 mount_bdev+0x26f/0x330 fs/super.c:1158 get_super_block+0x10/0x20 fs/reiserfs/super.c:2609 mount_fs+0x7f/0x2b0 fs/super.c:1261 wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 vfs_kern_mount.part.11+0x58/0x3d0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x376/0x2710 fs/namespace.c:2799 ksys_mount+0xb1/0xd0 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3026 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x46748a Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 RSP: 002b:00007fb75a353fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 000000000046748a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fb75a354000 RBP: 00007fb75a354040 R08: 00007fb75a354040 R09: 0000000020000000 R10: 0000000000208403 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fb75a354000 R15: 0000000020011500 The buggy address belongs to the page: page:ffffea0002012e00 count:0 mapcount:-128 mapping:0000000000000000 index:0x1 flags: 0xfff00000000000() raw: 00fff00000000000 ffffea0002047a08 ffffea0002047008 0000000000000000 raw: 0000000000000001 0000000000000003 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880804b7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880804b7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880804b8000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8880804b8080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff Bluetooth: hci3: command 0x0419 tx timeout ffff8880804b8100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ieee80211 phy13: Selected rate control algorithm 'minstrel_ht' ==================================================================